JPS Ultraconductor speaker cables posses the qualities you seek and for pennies on the dollar. Smooth liquid huge bass and delicate highs without harshness and a nice wide and deep detailed soundstage. There was a pair on here for sale about a week ago for $135! I actually use the dual bi-wire version which my or my not sound the same but if they sound like mine then you might have found your holy grail for very little investment.
I run (8 ps audio noise harvesters in room and everything through a passive bybee TAD power conditioner) oppo 95> vtl deluxe tube pre> bel canto evo6> Magnepan 2.6r (original xovers but bypassing the binding post plate) using all JPS cabling including power cables. NO HARSHNESS AT ALL, ONLY CRYSTALLINE HIGHS, LIQUID MIDRANGE AND SUPER TIGHT POWERFULL BASS!
Everything is system dependent but in my system they sing!
I run (8 ps audio noise harvesters in room and everything through a passive bybee TAD power conditioner) oppo 95> vtl deluxe tube pre> bel canto evo6> Magnepan 2.6r (original xovers but bypassing the binding post plate) using all JPS cabling including power cables. NO HARSHNESS AT ALL, ONLY CRYSTALLINE HIGHS, LIQUID MIDRANGE AND SUPER TIGHT POWERFULL BASS!
Everything is system dependent but in my system they sing!